ShardingJDBC 垂直拆分（不同的表在不同的库中）

上一篇介绍的了Sharding-JDBC不分库，只分表例子，接下来我们写demo，介绍SpringBoot使用Sharding-JDBC垂直拆分（不同的表在不同的库中）。话不多说，直接写代码。

准备

• SpringBoot 2.1.12
• Sharding-JDBC 4.0.0
• Mybatis 3.x
• Mysql 8.0
• lombok

本文场景介绍

一个数据库，将user表分表分为四个一样的表，根据取模算法分别向user0-3的表里插入数据。

POM文件

pom文件引入如下相关依赖：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>cn.cicoding</groupId>
        <artifactId>shardingsphere-example</artifactId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <groupId>cn.cicoding</groupId>
    <artifactId>sharding-jdbc-db-sharding</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>sharding-jdbc-db-sharding</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.0.1</version>
        </dependency>

        <dependency>
            <groupId>org.apache.shardingsphere</groupId>
            <artifactId>sharding-jdbc-spring-boot-starter</artifactId>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

相关代码实现

Controller代码

CicodingController代码

package cn.cicoding.controller;

import cn.cicoding.entity.Cicoding;
import cn.cicoding.service.CicodingService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class CicodingController {
	
	@Autowired
	private CicodingService cicodingService;
	
	@GetMapping("/cis")
	public Object list() {
		return cicodingService.list();
	}
	
	@GetMapping("/ci/add")
	public Object add() {
		for (long i = 0; i < 10; i++) {
			Cicoding cicoding = new Cicoding();
			cicoding.setId(i+"a");
			cicoding.setCity("深圳");
			cicoding.setRegion("宝安");
			cicoding.setName("李四");
			cicoding.setLdNum("A");
			cicoding.setUnitNum("2");
			cicodingService.addCicoding(cicoding);
		}
		return "success";
	}
	
}

UserController代码

package cn.cicoding.controller;

import cn.cicoding.entity.User;
import cn.cicoding.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class UserController {
	
	@Autowired
	private UserService userService;
	
	@GetMapping("/users")
	public Object list() {
		return userService.list();
	}
	
	@GetMapping("/add")
	public Object add() {
		for (long i = 0; i < 100; i++) {
			User user = new User();
			user.setCity("深圳");
			user.setName("李四");
			userService.add(user);
		}
		return "success";
	}
	
	@GetMapping("/users/{id}")
	public Object get(@PathVariable Long id) {
		return userService.findById(id);
	}
	
	@GetMapping("/users/query")
	public Object get(String name) {
		return userService.findByName(name);
	}
	
}

Service代码

CicodingService代码

package cn.cicoding.service;

import java.util.List;

import cn.cicoding.entity.Cicoding;

public interface CicodingService {

	List<Cicoding> list();
	
	Long addCicoding(Cicoding cicoding);
		
}

UserService代码

package cn.cicoding.service;

import cn.cicoding.entity.User;

import java.util.List;

public interface UserService {

	List<User> list();
	
	Long add(User user);
	
	User findById(Long id);
	
	User findByName(String name);
	
}

CicodingServiceImpl代码

package cn.cicoding.service;

import java.util.List;

import cn.cicoding.entity.Cicoding;
import cn.cicoding.repository.CicodingRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class CicodingServiceImpl implements CicodingService {

	@Autowired
	private CicodingRepository cicodingRepository;
	
	@Override
	public List<Cicoding> list() {
		return cicodingRepository.list();
	}

	@Override
	public Long addCicoding(Cicoding cicoding) {
		return cicodingRepository.addCicoding(cicoding);
	}

}

UserServiceImpl代码

package cn.cicoding.service;

import java.util.List;

import cn.cicoding.entity.User;
import cn.cicoding.repository.UserRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class UserServiceImpl implements UserService {

	@Autowired
	private UserRepository userRepository;
	
	public List<User> list() {
		return userRepository.list();
	}

	public Long add(User user) {
		return userRepository.addUser(user);
	}

	@Override
	public User findById(Long id) {
		return userRepository.findById(id);
	}

	@Override
	public User findByName(String name) {
		return userRepository.findByName(name);
	}

}

Repository代码

CicodingRepository代码

package cn.cicoding.repository;

import java.util.List;

import cn.cicoding.entity.Cicoding;
import org.apache.ibatis.annotations.Mapper;


@Mapper
public interface CicodingRepository {
	
	Long addCicoding(Cicoding cicoding);
	
	List<Cicoding> list();
}

UserRepository代码

package cn.cicoding.repository;

import java.util.List;

import cn.cicoding.entity.User;
import org.apache.ibatis.annotations.Mapper;

@Mapper
public interface UserRepository {
	
	Long addUser(User user);
	
	List<User> list();
	
	User findById(Long id);
	
	User findByName(String name);
}

Mapper.xml代码实现

CicodingMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="cn.cicoding.repository.CicodingRepository">
    
    <resultMap id="baseResultMap" type="cn.cicoding.entity.Cicoding">
        <result column="id" property="id" jdbcType="VARCHAR" />
        <result column="city" property="city" jdbcType="VARCHAR" />
        <result column="region" property="region" jdbcType="VARCHAR" />
        <result column="name" property="name" jdbcType="VARCHAR" />
        <result column="ld_num" property="ldNum" jdbcType="VARCHAR" />
        <result column="unit_num" property="unitNum" jdbcType="VARCHAR" />
    </resultMap>
    
    <insert id="addCicoding">
        INSERT INTO cicoding (
           id, city, region, name, ld_num, unit_num
        )
        VALUES (
           #{id,jdbcType=VARCHAR},
           #{city,jdbcType=VARCHAR},
           #{region,jdbcType=VARCHAR},
           #{name,jdbcType=VARCHAR},
           #{ldNum,jdbcType=VARCHAR},
           #{unitNum,jdbcType=VARCHAR}
        )
    </insert>
   
    <select id="list" resultMap="baseResultMap">
        SELECT ld.* FROM cicoding ld
    </select>
       
</mapper>

UserMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="cn.cicoding.repository.UserRepository">
    
    <resultMap id="baseResultMap" type="cn.cicoding.entity.User">
        <result column="id" property="id" jdbcType="INTEGER" />
        <result column="city" property="city" jdbcType="VARCHAR" />
        <result column="name" property="name" jdbcType="VARCHAR" />
    </resultMap>
    
    <insert id="addUser">
        INSERT INTO user (
           city, name
        )
        VALUES (
        #{city,jdbcType=VARCHAR},
        #{name,jdbcType=VARCHAR}
        )
    </insert>
   
    <select id="list" resultMap="baseResultMap">
        SELECT u.* FROM user u
    </select>
	
	<select id="findById" resultMap="baseResultMap">
        SELECT u.* FROM user u WHERE u.id=#{id,jdbcType=INTEGER}
    </select>
    
    <select id="findByName" resultMap="baseResultMap">
        SELECT u.* FROM user u WHERE u.name=#{name,jdbcType=VARCHAR}
    </select>
    
</mapper>

实体类

Cicoding

package cn.cicoding.entity;

import lombok.Data;

/**
 * 不分表
 * @author zhaokejin
 *
 */
@Data
public class Cicoding {

	private String id;
	
	private String city;
	
	private String region;
	
	private String name;
	
	private String ldNum;
	
	private String unitNum;
	
}



User
    
package cn.cicoding.entity;

import java.io.Serializable;

/**
 * 分表
 * @author zhaokejin
 *
 */
public class User implements Serializable {

	private static final long serialVersionUID = -1205226416664488559L;
	
	private Long id;

	private String city = "";
	
	private String name = "";

	public Long getId() {
		return id;
	}

	public void setId(Long id) {
		this.id = id;
	}

	public String getCity() {
		return city;
	}

	public void setCity(String city) {
		this.city = city;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}
	
	
}

到这我们完成了基本的代码编写，由于sharding-jdbc是jar包，我们来看主要的配置信息

#Sharding JDBC 垂直拆分（不同的表在不同的库中）
server.port=8084

# mybatis对应的映射文件路径
mybatis.mapper-locations=classpath:mapper/*.xml
# mybatis对应的实体类
mybatis.type-aliases-package=cn.cicoding.model

spring.shardingsphere.datasource.names=ds0,ds1

# 数据源
spring.shardingsphere.datasource.ds0.type=com.zaxxer.hikari.HikariDataSource
spring.shardingsphere.datasource.ds0.driver-class-name=com.mysql.cj.jdbc.Driver
spring.shardingsphere.datasource.ds0.jdbc-url=jdbc:mysql://localhost:3309/ds0?useSSL=false&useUnicode=true&characterEncoding=utf8&serverTimezone=UTC
spring.shardingsphere.datasource.ds0.username=root
spring.shardingsphere.datasource.ds0.password=root

spring.shardingsphere.datasource.ds1.type=com.zaxxer.hikari.HikariDataSource
spring.shardingsphere.datasource.ds1.driver-class-name=com.mysql.cj.jdbc.Driver
spring.shardingsphere.datasource.ds1.jdbc-url=jdbc:mysql://localhost:3309/ds1?useSSL=false&useUnicode=true&characterEncoding=utf8&serverTimezone=UTC
spring.shardingsphere.datasource.ds1.username=root
spring.shardingsphere.datasource.ds1.password=root

# 绑定cicoding表所在节点
spring.shardingsphere.sharding.tables.cicoding.actual-data-nodes=ds1.cicoding

# 绑定user表所在节点
spring.shardingsphere.sharding.tables.user.actual-data-nodes=ds0.user
spring.shardingsphere.sharding.tables.user.key-generator.column=id
spring.shardingsphere.sharding.tables.user.key-generator.type=SNOWFLAKE

# 显示SQL
spring.shardingsphere.props.sql.show=true

启动类

package cn.cicoding;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

/**
 * Sharding JDBC 垂直拆分（不同的表在不同的库中）
 */
@SpringBootApplication
public class ShardingJdbcDbShardingApplication {

   public static void main(String[] args) {
      SpringApplication.run(ShardingJdbcDbShardingApplication.class, args);
   }

}

测试演示

启动启动类，访问http://localhost:8084/add

http://localhost:8084/cis

分别进入不同的库！

到此我们就实现了sharding-jdbc主从读写分离实现，更多配置请参考此处！